Open AccessStrong hyperbolic-magnetic polaritons coupling in an hBN/Ag-grating heterostructure
Author(s) -
Jigang Hu,
Xie Wang,
Junxue Chen,
LeiMing Zhou,
Wei Liu,
Dongmei Li,
Qiwen Zhan
Publication year - 2020
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.398182
Subject(s) - polariton , grating , optics , materials science , coupling (piping) , zigzag , condensed matter physics , resonance (particle physics) , absorption (acoustics) , physics , optoelectronics , atomic physics , geometry , mathematics , metallurgy
Strong coupling between hyperbolic phonon-polaritons (HP) and magnetic polaritons (MP) is theoretically studied in a hexagonal boron nitride (hBN) covered deep silver grating structure. It is found that MP in grating trenches strongly interacts with HP in an anisotropic hBN thin film, leading to a large Rabi splitting with near-perfect dual band light absorption. Numerical results indicate that MP-HP coupling can be tuned by geometric parameters of the structure. More intriguingly, the resonantly enhanced fields for two branches of the hybrid mode demonstrate unusually different field patterns. One exhibits a volume-confined Zigzag propagation pattern in the hBN film, while the other shows a field-localization near the grating corners. Furthermore, resonance frequencies of these strongly coupled modes are very robust over a wide-angle range. The angle-insensitive strong interaction of hyperbolic-magnetic polaritons with dual band intense light absorption in this hybrid system offers a new paradigm for the development of various optical detecting, sensing and thermal emitting devices.